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The oil pump sucks in oil near the bottom of the carter, but if you run very low it may draw air instead when you are on an incline or through a corner where the oil slopes to the sides. Air in the oil lines is not good, the pump should draw oil all the time.
If the oil level is high the pump will have to work ever so slightly less hard because of the fractionally higher pressure at its intake.
0W oils do save some, especially in colder climates. I see lower idling when cold and slower warm-up due to less friction.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
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For education go to people unlike yourself.
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